Clamp tor centering hubs eor boring



UNITE@ STATESl PATENT OFFICE.

JOHN THRASHER, OF AVON, NEW YORK.

CLAMP FOR CENTERING HUBS FOR BORING.

Specification of Letters Patent No. 18,612, dated November 10, 1857.

To all whom 'it may concern.'

Be it known that I, Jol-IN THRAsHER, of Avon, in the county of Livingston and State of New York, have invented certain new and useful Improvements in Machines for Boring Hubs; and I do hereby declare that the same are described and represented y in the following specifications and drawings.

To enable others skilled in the art to make and use my improvements I will proceed to describe their construction and operation referring to the drawings in which the same letters indicate like parts in each of the figures.

Figure l, is an elevation of the front of the machine. Fig. 2, is an elevation of one side. Fig. 3, is a side and end of the serrated cutter.

The nature of my invention and improvements consists in three or more vibrating arms connected by links to a screw which operates them so as to center and hold the hub while it is being bored. And in an apparatus to clamp the wheel after it is centered and hold it while the hub is being bored.

In the accompanying drawings A, A, is a rectangular frame forming the base of the machine; into which the front posts B, B, and rear posts O, C, are fastened; the latter being connected at the top by the bar D.

E, is a bar having the disk F in the center supported by studs one of which is seen at Gr, Fig. 2. These studs are fastened into the ends of the bar E and pass through the posts O, C, and are secured by nuts, one of which is shown at H. The disk F, is made in the form shown in Fig. l, and has four arms or levers I, I, fitted t-o it as shown in the drawing. These arms are operated by the links J, J, connected to their rear ends and to the nut K, on the screw L, which has its end fitted to turn freely in the center of the disk F, so that when the screw is turned by the cranks M, M, the links and levers or arms are operated so as to seize the end of a hub and bring its center directly opposite to the center of the screw L, and hold it there while it is bored or reanied as may be desired.

The bars N, N, are locked onto the posts O, O, so that their front sides are in the same plane with the front of the posts C, C, so that the rim of the wheel may rest in two places on each of the posts and bars, while the hub is being reamed, or bored and reamed; the rim of the wheel being clamped or drawn against the front of the frame by hooks one of which is shown at P, Fig. 2. These hooks are provided with crank nuts Q, which are turned to tighten the hooks on the rim and draw it to the frame.

The hooks P, P, are arranged in the blocks R, R, which are fitted to traverse between the bars N, N, on the ribs S, S, provided for that purpose so as to adjust the hooks to suitthe size of the wheel to be operated upon.

The front posts B, B, arc connected by the bar T, which has the bar T', lying upon it and secured by the hinge U, and Iienon V, which has a pin through it to hold the bar T', onto the bar T, as shown in Fig. l. The screw L, is bored through its whole length to receive the end of the cutter shaft IV, which is fitted t-o turn freely in it. The opposite end of the shaft W, has a male screw upon it which turns in the female screw cut in the bars T, and T, so as to traverse the shaft and carry the cutters fastened in it into the hub, as the shaft is turned. The cutters a, a, are fitted to mortises in the shaft IV, and fastened by the wedges o, b. The cutter c, is made in the form shown in Fig. 3, that is with a notched or serrated edge having the teeth curved forward as shown in the drawings; so that it may be operated with far less power than it could be, if the edge was not turned or curved forward. This cutter c, is-fltted to a long mortise in the shaft W, so that it can 'be adjusted as desired and fastened by the screws e, e, in the shaft.

To bore a hub o-r ream it, the bar T', is raised, so as to release the shaft W, which is removed, when the hub is placed between the ends of the arms I, I, and the rim of the wheel against the front of the posts O, C, and bars N, N; when the ends of the arms are brought against the hub by turning the screw L, so as to bring the center of the hub opposite to the center` of the screw L; when this is done, the blocks R, R, are moved so as to bring the hooks P, P, onto the edge or rim of the wheel and hold it against the frame. The shaft W, is now put through the hub, and the end put into the screw L, and the bar T', brought down and fastened by the pin in the tenon V, when the shaft and cutters are turned by the crank X, and

I claim- The combination of the vibrating arms I, I, links J J and screw L, constructed 15 and arranged substantially as described, for the purpose of centering and holding the hub While it is being reamed, or bored and reamed.

JOHN THRASHER.

Witnesses I. DENNIS, Jr., F. S. MYER. 

